Incorrect output of ToMinimalDisplayString() with namespace hiding

[ltcmelo]

Version Used: 2.10

Steps to Reproduce: Consider the 2 files below.

test1.cs

using System;
namespace Abc.System {}
namespace Abc
{
    public class Test
    {
        public void fff()
        {
            Video vvv = null;
            foreach (var ooo in vvv.getlist()) {}
        }
    }
}

test2.cs

using System.Collections.Generic;
class Video
{
    public IEnumerable<int> getlist() { return null; }
}

Actual Behavior:

If I get the ITypeSymbol of vvv.getlist() and its minimal display string through ToMinimalDisplayString() (in the span of the in the foreach statement), I get System.Collections.Generic.IEnumerable<int>, which is not correct.

Expected Behavior:

Given that the minimal display string is expected to be semantically correct within the scope in question, the correct value of it should, in my opinion, be global::System.Collections.Generic.IEnumerable<int>.

NOTE: This behaviour would lead to a compilation error if the computed string is being use for any sort of code rewriting.

NOTE 2: I'm using the default display format, which, I believe, should account for such case.

UPDATE

See #36655 as well.

[CyrusNajmabadi]

See #80757. This is not something we could change due to the deep impacct on the ecosystem (tons of stuff using this helper). ToMinimalDisplayString defaults to not including 'global'. But you can opt in safely to adding that for cases like these (and it will not add it if not needed elsewhere).